import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.IOException;

@WebServlet("/postParameter")
public class PostParameterServlet extends HttpServlet {
    @Override
    protected void doPost(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        // 假设传过来的参数是 aa=10&bb=20
        String aa = req.getParameter("aa");
        String bb = req.getParameter("bb");

        resp.getWriter().write("aa = " + aa + ", bb = " + bb);
    }
}
